Green’s Dictionary of Slang

work out v.

[SE work out, to exercise]

1. (US Und.) to beat up; to give the ‘third degree’.

[US]Goldin et al. DAUL 239/2: Workout, v. To give a workout.

2. (US black) to have sexual intercourse.

[US]Current Sl. III:1 15: Work out, v. To engage in sexual intercourse.